1. Movable finger of pedipalps with 7 rows of median denticles, 7 ID and 7 OD (Figs. 111–114); metasoma IV–V of adults ventrally smooth and punctate; punctae on ventral surface of metasoma V small, with diameters less than mean distance between their centroids, occupying less area than smooth surfaces between them (Figs. 82–83); pedipalps more slender, patella L/W 2.5–3.0 ……........... 2
– Movable finger of pedipalps with 8–9 rows of median denticles, 9 ID and 9 OD (Figs. 115–118); metasoma IV–V of adults ventrally rugose-reticulate; inter-reticular depressions or lacunae on ventral surface of metasoma V large, irregularly shaped, with diameters comparable to mean distance between their centroids, occupying more area than raised reticular surfaces (Figs. 13–18, 60–63, 84–86); pedipalps more stout, patella L/W 2.1–2.3........ 3
2. Pedipalps with patella and chela manus brown or black, darker than fingers (Figs. 87–94); sternite VII matte, almost smooth................................... O. insularis (Pocock, 1899)
– Pedipalps with patella and entire chela yellow (Figs. 95– 102); sternite VII coarsely granulated............................................................................. O. socotrensis Kovařík, 2004
3. Border between dorsomedian and dorsolateral surfaces of metasoma IV–V distinct, demarcated by dorsosubmedian carina; dorsal surfaces of metasoma III–V weakly rugose laterally (Fig. 86); metasoma IV ventromedially rugosegranulate (Fig. 85)...................... O. vachoni Kovařík, 1998
– Border between dorsomedian and dorsolateral surfaces of metasoma IV–V indistinct, not demarcated by dorsosubmedian carina; dorsal surfaces of metasoma III–V strongly rugose or rugose-reticulate laterally (Fig. 18); metasoma IV ventromedially granulate (Fig. 17). …………………………………… O. somalilandus sp. n.